Question 1
A solution of NaF(aq) is added dropwise to a solution that is 0.0102 mol L
-1 in Ba
2+(aq). When the concentration of F
-(aq) exceeds ________ mol L
-1, BaF
2(s) will precipitate. Neglect volume changes. For BaF
2(s),
◦ 8.6 × 10
-5◦ 1.3 × 10
-2◦ 1.7 × 10
-8◦ 3.3 × 10
-3◦ 1.7 × 10
-4Question 2
A swimming pool was sufficiently alkaline so that the carbon dioxide absorbed from the air produced a solution in the pool that was 2 × 10
-4 M in carbonate ion. If the pool originally contained 4 × 10
-3 M Mg
2+, 6 × 10
-4 M Ca
2+, and 8 × 10
-7 M Fe
2+, then the precipitate that was formed consisted of ________.
(
Ksp values are: CaCO
3, 4.7 × 10
-9; MgCO
3, 4.0 × 10
-5; FeCO
3, 2.0 × 10
-11)
◦ only MgCO
3 ◦ only CaCO
3 ◦ only FeCO
3 ◦ only CaCO
3 and FeCO
3 ◦ MgCO
3, CaCO
3, and FeCO
3
Recombinants are produced by crossovers
The Carbon Cycle
Bill Viola, The Reflecting Pool.
Amino Acid carbon skeleton
In 1969 a UC Berkeley group fired a carbon nucleus at a californium target. Give